Currently Being ModeratedJan 24, 2013 6:31 PM (in response to Malorum)
Please do "About this Mac" from your Apple menu. Reprot what is says for the Mac OS version AND the processor info. If it reports your processor as a "PowerPC like this:
you cannot upgrade higher than OS 10.5.8 "Leopard." If it says you have an Intel processor like this:
you can upgrade to at least 10.6.8 "Snow Leopard" and maybe farther, depending on some extra info we'll need to get from you.